petsc-3.12.5 2020-03-29

VecStrideSubSetScatter

Scatters components from a vector into a subset of components of a multi-component vector.

#include "petscvec.h" 
PetscErrorCode  VecStrideSubSetScatter(Vec s,PetscInt nidx,const PetscInt idxs[],const PetscInt idxv[],Vec v,InsertMode addv)

Collective on Vec

	s	- the smaller-component vector
	nidx	- the number of indices in idx
	idxs	- the indices of the components in the smaller-component vector, 0 <= idxs[0] ...idxs[nidx-1] < bs(s) they need not be sorted, may be null if nidx == bs(s) or is PETSC_DETERMINE
	idxv	- the indices of the components in the larger-component vector, 0 <= idx[0] ...idx[nidx-1] < bs(v) they need not be sorted
	addv	- one of ADD_VALUES,INSERT_VALUES,MAX_VALUES

v -the location where the subvector is into scattered (the multi-component vector)

One must call VecSetBlockSize() on the vectors before this routine to set the stride information, or use a vector created from a multicomponent DMDA.

The parallel layout of the vector and the subvector must be the same;

Not optimized; could be easily

advanced